Tarif Novogodniy (2008) on Netflix

Plot summary

Andrey comes back to Moscow and buys a replacement phone, and the unusual woman at the store gives him a plan called the New Year's Tariff. He joins his friends in Red Square on New Year's Eve, where the custom is to call a number chosen at random and offer a stranger New Year's greetings. Alyona answers, alone after a recent breakup, and the two keep talking on the phone; Andrey nearly falls in love with her. When they try to meet, they discover that a year divides them: Andrey is calling from 2009, and Alyona is spending New Year's Eve in 2008.